2121220422 has 48 divisors (see below), whose sum is σ = 4671510480. Its totient is φ = 695506176.

The previous prime is 2121220417. The next prime is 2121220429. The reversal of 2121220422 is 2240221212.

2121220422 is a `hidden beast` number, since 2 + 1 + 21 + 220 + 422 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2121220395 and 2121220404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121220429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 535453 + ... + 539399.

It is an arithmetic number, because the mean of its divisors is an integer number (97323135).

Almost surely, 2^2121220422 is an apocalyptic number.

2121220422 is an abundant number, since it is smaller than the sum of its proper divisors (2550290058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121220422 is a wasteful number, since it uses less digits than its factorization.

2121220422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4437 (or 4434 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 2121220422 is about 46056.7087621337. The cubic root of 2121220422 is about 1284.8781187170.

Adding to 2121220422 its reverse (2240221212), we get a palindrome (4361441634).

The spelling of 2121220422 in words is "two billion, one hundred twenty-one million, two hundred twenty thousand, four hundred twenty-two".